SRAM X9 10 speed rear mech - take apart / disassemble?

I broke the cage on my SRAM X9 10 speed short cage rear mech the other day, I have just got a 2nd hand replacement through the post which I was just going to replace the broken one with, but the whole parallelogram on the replacement is a little bit wobbly (wasn't mentioned in the description and is important imo) so I want to see if I can just swap the cages over.

I don't think you can strip down/remove the outer cage on the X9, unlike the X0. As I recall, there is the removable limit bolt on the cage, unlike with X0. Without being able to remove the limit bolt, you won't be able to spin the cage around to de-tension the spings and then remove the cage. However......you could also wall drill out the fixed limit screw and make up a replacement with a another bolt.